Garlic

Garlic destroys cancer cells and may disrupt the metabolism of tumor cells, says Karen Collins, RD, nutrition advisor to the American Institute for Cancer Research. "Studies suggest that one or two cloves weekly provide cancer-protective benefits."

"Let garlic sit for 10 to 15 minutes after chopping and before cooking so the active form of the protective phytochemicals develops," says Collins. Saute fresh garlic over low heat and mix with pasta, red pepper flakes, and Parmesan cheese.